Question

Potassium chlorate decomposes into potassium chloride and oxygen gas. How many grams of oxygen are produced when 1.06 grams of potassium chlorate decompose completely?

Answer 1

The amount of oxygen that are produced when 1.06 grams of potassium chlorate decompose completely is 0.64 grams.

What is the relation between mass & moles?

Relation between the mass and moles of any substance will be represented as:

• n = W/M, where
• W = given mass
• M = molar mass

Moles of potassium chlorate = 1.66g / 122.5g/mol = 0.0135mole

Given chemical reaction is:

2KClO₃ → 2KCl + 3O₂

From the stoichiometry of the reaction, it is clear that:

2 moles of KClO₃ = produces 3 moles of O₂

0.0135 moles of KClO₃ = produces (3/2)(0.0135)=0.02 moles of O₂

Mass of oxygen = (0.02mol)(32g/mol) = 0.64 g

Hence produced mass of oxygen is 0.64 grams.

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